Tumbler for gold-dredging machines.



No. 767,009. PATENTBD AUG. 9, 1904. 0. B. PERRY. TUMBLER FOR GOLD DREDGING MACHINES.

APPLICATION I ILED NOV. 5, 1903. N0 MODEL. 2 SHEETS-SHEET 1.

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PATENTED AUG. 9, 1904. 0. B. PERRY. TUMBLER FOR GOLD DREDGINGMACHINES.

APPLICATION TILED NOV.5,1003.

2 SHEETS-$181211! 2.

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UNITED STATES Patented August 9, 1904.

PATENT OFFICE.

TUMBLEF? FOR GOLD-DREDGING MACHlNEEi.

SPECIFICATION forming part of Letters Patent No. 767,009, dated August 9, 1904 Application filed November 5, 1903. Serial No. 179,903. (No model.)

To (Z whom it may concern:

Be it known that I, OSCAR BUTLER PERRY, a citizen of the United States, residing at San Francisco, county of San Francisco, State of California, have invented certain new and use l ful Improvements in Tumblers for Gold- Dredging Machines; and I do hereby declare chinery, and has for its object to provide an improved form of tumbler for the swinging ladder over which the endless carrier for the cutting-buckets works.

More particularly considered, the invention contemplates the provision of a tumbler whose faces are shaped to conform to the bearings of the buckets, so as to allow gravel and stones to' fall through the tumbler without damaging the buckets.

It also contemplates protecting the wearing surfaces-viz., the faces and corners or cars of the tu1nblerby means of removable hardmetal plates.

Referring to the accompanying drawings, Figure 1 is a front elevation of my improved tumbler, showing the relation of the ratchetshaped bearing-faces and the arrangement of the weai'ingplates. Fig. 2 is a side elevation of one of the tumbler-sections, and Fig. 3 is a section on line 3 3 of Fig. 2.

In the drawings the numeral 1 indicates a shaft adapted to be rotatably mounted in suit able bearings in the side frames of the swinging ladder of the elevator mechanism commonly employed in gold-dredging and analogous machines. Keyed or otherwise rigidly secured to the shaft 1 and separated from each other to properly support the endless chain of elevator-buckets are two rolls or drums, which constitute the tumbler. Each drum comprises a central hub 3, supporting a web or flange 2, providedwith a polygonal series of bearing-faces 4, which are strengthened and supported by integral brackets 5, uniting the hub, web, and bearing-faces in a rigid integral structure. The flange 2 is provided with radially-projecting ears or corners 6, each havrecess 9, which lies opposite a similar recess in the corresponding face of the other drum, so that when the tumbler is assembled in position on the shaft 1 it presents to the endless carrier a series of bearing-faces, each of which is shaped to follow or conform to the bearing of the bucket engaging it and each of which is provided with a forwardly-flaring opening through which gravel, stones, and other obstructing matter is forced without damaging the bucket.

In order to protect those portions of the tumbler which come in contact with the endless carrier from wear, the faces at and the ears 6 are covered by wear-plates 7 and 8, respective] y, formed to appropriate shape, of manganese steel or other hard resistant material. These plates, which are designed to be renewed when they have become unduly worn or damaged, are secured to the faces and corners or cars of the drum by means of rivets or other appropriate devices.

It is obvious, of course, that the tumbler as above described may be applied to either or both the upper and lower portions of the ladder, and in either relation it will subserve the purposes for which it is (.lesigned, to wit: By presenting ratchetshaped bearing-surfaces to the buckets, which conform to the shape of the latter instead of being rectangular, as here tofore constructed, it operates to free itself from boulders and other obstructing matter, which have always been a source of great trouble, and by protecting the wearing parts of the tumbler, particularly the tumblers ears and faces, by highly-resistantreplaceable plates the life of the apparatus is greatly increased, and as all of the wearing parts are made replaceable and interchangeable necessary repairs are materially facilitated.

WVhat I claim as my invention is 1. A tumbler for dredging-machines and the like, having its bearing-faces shaped to conform to the bearings of the buckets, and provided with flaring openings through which boulders and other obstructing matter are forced to clear the tumbler; substantially as described.

2. A tumbler for dredging-machines and the like, comprising two separate drum-sections mounted upon a shaft, said sections having ratchet-shaped bearing-surfaces conforming to the bearings of the buckets, said ratchetshaped surfaces providing flaring openings to clear the tumbler of obstructing matter; substantially as described.

3. A tumbler for dredging-machines and the like, comprising two drum-sections having ratchet-shaped bearing-surfaces to provide flaring openings to clear the tumbler of ob structing matter, and plates of wear-resisting material secured to said bearing-surfaces; sub- 'stantially as described.

Wear-resisting material secured to said faces and ears; substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

OSCAR BUTLER PERRY.

Witnesses:

MAURICE E. GRIFFIN, GERTRUDE JOHNSON. 

